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"If you don't build a new road, you don't have tolls on roads where people are driving exactly where they're driving today, but get stung with a toll."

He said the NSW government had asked for matching funding of $1.8 billion.

The figure outstrips Opposition Leader Tony Abbott's offer of $1.5 billion, with no toll conditions, but shadow treasurer Joe Hockey said the coalition would not enter an auction with the government to win voters.

"We are being honest with the people of western Sydney. We will deliver programs based on what is affordable," he told Sky News.

"If the prime minister wants to make an unaffordable promise without proper consultation with the state government that's her call, but under the Labor party WestConnex will never be delivered."

The proposed WestConnex project, recommended by Infrastructure NSW last year, would link the M4 to the airport, Port Botany and the M5 East and ease congestion in western Sydney.